112 lines
3.9 KiB
Python
112 lines
3.9 KiB
Python
import json
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import os
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import subprocess as sp
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import sys
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import tempfile
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import urllib
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from argparse import ArgumentParser
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from os.path import realpath, dirname
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from urllib.request import urlretrieve
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from mach_nix.versions import PyVer
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def ensure_nix():
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nix_installed = True
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try:
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sp.run(['nix', '--version'], check=True, capture_output=True)
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except FileNotFoundError:
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nix_installed = False
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if nix_installed:
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return
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print("The nix package manager is required! Install it now? [Y/n]: ", end='')
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answer = input()
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if not answer or answer[0].lower() != 'y':
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exit(1)
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with urllib.request.urlopen('https://nixos.org/nix/install') as f:
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install_script = f.read()
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read, write = os.pipe()
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os.write(write, install_script)
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os.close(write)
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proc = sp.run('sh', stdin=read)
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if proc.returncode:
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print("Error while installing nix. Please check https://nixos.org/download.html and install manually.",
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file=sys.stderr)
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exit(1)
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def gen(args, quiet: bool, return_expr=False):
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with open(args.r) as f:
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requirements = f.read().strip()
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pwd = dirname(realpath(__file__))
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o_file = tempfile.mktemp()
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py_ver = PyVer(args.python)
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cmd = f'nix-build {pwd}/nix/expression.nix -o {o_file}' \
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f' --argstr requirements "{requirements}"' \
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f' --argstr python_attr python{py_ver.digits()}' \
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f' --arg prefer_nixpkgs {json.dumps((not args.prefer_new))}'
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proc = sp.run(cmd, shell=True, capture_output=quiet)
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if proc.returncode:
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if quiet:
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print(proc.stderr.decode(), file=sys.stderr)
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exit(1)
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with open(f"{o_file}/share/expr.nix") as src:
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expr = src.read()
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if return_expr:
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return expr
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if getattr(args, 'o', None):
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with open(args.o, 'w') as dest:
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dest.write(expr)
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print(f"Expression written to {args.o}")
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else:
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print(expr)
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def env(args):
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target_dir = args.directory
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expr = gen(args, quiet=False, return_expr=True)
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python_nix_file = f"{target_dir}/python.nix"
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shell_nix_file = f"{target_dir}/shell.nix"
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default_nix_file = f"{target_dir}/default.nix"
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if not os.path.isdir(target_dir):
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if os.path.exists(target_dir):
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print(f'Error: {target_dir} already exists and is not a directory!')
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exit(1)
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os.mkdir(target_dir)
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with open(python_nix_file, 'w') as python:
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with open(shell_nix_file, 'w') as shell:
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with open(default_nix_file, 'w') as default:
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python.write(expr)
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shell.write("(import ./python.nix).env\n")
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default.write("import ./shell.nix\n")
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print(f"created files: {python_nix_file}, {shell_nix_file}")
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def main():
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parser = ArgumentParser()
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parser.add_argument('-p', '--python', help='select python version (default: 3.7)',
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choices=('2.7', '3.5', '3.6', '3.7', '3.8'), default='3.7')
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parser.add_argument('-r', help='path to requirements.txt file', metavar='requirements.txt', required=True)
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subparsers = parser.add_subparsers(dest='command', required=True)
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parser.add_argument('--prefer-new', action='store_true',
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help='Prefer newer python package versions instead of the ones from nixpkgs. '
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'This might increase build times significantly since no cache can be used',)
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gen_parser = subparsers.add_parser('gen', help='generate a nix expression')
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gen_parser.add_argument('-o', help='output file. defaults to stdout')
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env_parser = subparsers.add_parser('env', help='set up a venv-style environment')
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env_parser.add_argument('directory', help='target directory to create the environment')
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args = parser.parse_args()
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ensure_nix()
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if args.command == 'gen':
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gen(args, quiet=not args.o)
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elif args.command == 'env':
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env(args)
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if __name__ == "__main__":
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main()
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